Thanks. To TC too.The entire foil (which is everything attached to the bottom of the arm) has to fit in the box defined in fig. 13.1 (reproduced below), the appendage on the tip seems to go well outside the box.
The wings must be symmetrical about the junction with the arm (strictly the wing symmetry plane) so no special shapes on just one tip:
13.6 A foil wing must be symmetric about the foil wing symmetry plane, as defined in Figure 13.1, with a build tolerance of 3.0 mm, except that within 75 mm of the foil wing symmetry plane, non-structural fairings on the foil wing are not required to be symmetric.
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